JavaScript@javascript · channel · 30 984 subscribers✅ High trust

Post CHALLENGE

18 September 2026

JavaScript

CHALLENGE let i = 0; const key = () => `k${i++}`; const obj = { [key()]: i, [key()]: i, [key()]: i, }; console.log(Object.keys(obj).join(','), obj.k0, obj.k1, obj.k2);

1 · 2.1K · 06:31

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JavaScript06:31CHALLENGE const nums = [1, 2, 3, 4, 5]; const result = nums .filter(n => n % 2 !== 0) .map(n => n ** 2) .reduce((acc, n) => acc + n, 0); const arr = [10, , 20, J

JavaScript06:31Poll

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JavaScript06:31Poll J

JavaScript06:31CHALLENGE const a = 5 & 3; const b = 5 | 2; const c = ~5; const d = 1 << 31; const e = -1 >>> 28; const f = 5 ^ 5; console.log(a, b, c, d, e, f);

JavaScript@javascript · channel · Tech

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